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Colonography: Difference between revisions

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* Screening for [[colorectal cancer]]
* Screening for [[colorectal cancer]]
* Rectal atresia (Wangensteen-Rice x-ray is used)
* Rectal atresia (Wangensteen-Rice x-ray is used)
* Abdominal abcess
* [[Abdominal abcess]]
* [[Inflammatory bowel disease]]
* [[Inflammatory bowel disease (Crohn disease and ulcerative colitis)|Inflammatory bowel disease]]
* [[Colonic polyps]]
* [[Colonic polyps]]


== Patient preparation ==
== Patient preparation ==
Emptying the bowel before colonography is essential. The patient must fast minimum 6 hours ahead and only consume clear fluids (water and thin drinks) the day before. A strong laxative must be given to empty the bowel completely.
Emptying the bowel before colonography is essential. The patient must fast minimum 6 hours ahead and only consume clear fluids (water and thin drinks) the day before. A strong [[laxative]] must be given to empty the bowel completely.


== Interpretation ==
== Interpretation ==
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In case of colitis, the bowel wall is thickened and the bowel lumen is irregularly narrowed.
In case of colitis, the bowel wall is thickened and the bowel lumen is irregularly narrowed.


== Defecography ==
== Lesser used colonic studies ==
 
=== Colonic transit study ===
A colonic transit study can be used to evaluate constipation. It involves the patient swallowing a capsule containing many small radiopaque markers. Serial radiographs are then taken, allowing one to visualise the movement of the markers over time.
 
=== Defecography ===
Defecography is a rarely used procedure used to evaluate for constipation. The rectum is filled with barium paste, and the patient defecates during [[Fluoroscopy|fluoroscopic]] examination.
Defecography is a rarely used procedure used to evaluate for constipation. The rectum is filled with barium paste, and the patient defecates during [[Fluoroscopy|fluoroscopic]] examination.
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[[Category:Radiology]]
[[Category:Radiology]]
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